[root@zhiwang-01 yum.repos.d]# yum makecache
已加载插件：fastestmirror, product-id, search-disabled-repos, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Determining fastest mirrors
http://mirrors.163.com/centos/%24releasever/os/x86_64/repodata/repomd.xml: [Errno 14] PYCURL ERROR 22 - "The requested URL returned error: 404 Not Found"
To address this issue please refer to the below knowledge base article
If above article doesn't help to resolve this issue please open a ticket with Red Hat Support.
错误：Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again